Fix shellcheck

Author: singiamtel

git-ls-blame

@@ -47,7 +47,7 @@ while read -r item; do
 
 		# Track max length
 		len=${#display_name}
-		[ $len -gt $max_len ] && max_len=$len
+		[ "$len" -gt "$max_len" ] && max_len=$len
 	fi
 done <<< "$items"